A renormalised hamiltonian approach for a resonant valence bond wavefunction

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dc.creatorZhang, F. C.
dc.creatorGros, C.
dc.creatorRice, T. M.
dc.creatorShiba, H.
dc.date2003-11-26
dc.date.accessioned2026-07-07T06:29:03Z
dc.date.available2026-07-07T06:29:03Z
dc.descriptionThe effective Hamiltonian of strongly correlated electrons on a square lattice is replaced by a renormalised Hamiltonian and the factors that renormalise the kinetic energy of holes and the Heisenberg spin-spin coupling are calculated using a Gutzwiller approximation scheme. The accuracy of this renormalisation procedure is tested numerically and found to be qualitatively excellent. Within the scheme a resonant valence bond (RVB) wavefunction is found at half-filling to be lower in energy than the antiferromagnetic state. If the wavefunction is expressed in fermion operators, local SU(2) and U(l) invariance leads to a redundancy in the representation. The introduction of holes removes these local invariances and we find that a d-wave RVB state is lowest in energy. This state has a superconducting order parameter whose amplitude is linear in the density of holes.
dc.descriptionreproduced for reader's convenience. one of key references in cond-mat/0311467. Reprint at http://www.physics.hku.hk/~fczhang
dc.identifierhttps://arxiv.org/abs/cond-mat/0311604
dc.identifierhttp://arxiv.org/abs/cond-mat/0311604
dc.identifierSupercond.Sci.Technol. 1 (1988) 36
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/97901
dc.subjectStrongly Correlated Electrons
dc.titleA renormalised hamiltonian approach for a resonant valence bond wavefunction
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